Promotional effects of Pt–CeO2 fabricated by hydrothermal leaching of Al78Ce22-xPtx (x = 0, 0.1) intermetallic compound for efficient catalytic CO oxidation

Promotional Effects of Heat Treatments on Pt–CeO2 Nanocatalyst Derived via Hydrothermal Leaching for CO Oxidation

“…The rising order of BET surface area matches the increasing order of catalytic activity, with the sample with the most surface area having the maximum catalytic activity. Based on the previous reports, more active oxygen species are produced after heat treatment in the H 2 /N 2 atmosphere (i.e., oxygen species are induced from CeO 2 to the surface). This was the reason for slightly better performance for heat treatment in H 2 /N 2 with a Pt–O–Ce interaction.…”

“…Better hysteresis was ascribed to high Pt dispersion on CeO 2 , more active sites, and the strong interaction of Pt–CeO 2 . Previous studies − reported the relationship between catalytic activity and particle size, finding that catalytic efficiency improves as particle size and surface area increase. Therefore, heat treatment in the H 2 /N 2 atmosphere was found to have a higher surface area, smaller particle size, and improved catalytic activity than heat treatment in the air atmosphere.…”

“…Initially, the Al 78 Ce 21.9 Pt 0.1 ingot was prepared, and hydrothermal leaching of the prepared ingot was performed. The precursor of the nanocatalysts was prepared using the previously reported method, 32 followed by heat treatment of Al 78 Ce 21.9 Pt 0.1 after hydrothermal leaching (AL). The heat treatment was performed at 300 °C for 15 min in a 50% H 2 /N 2 atmosphere.…”

Pt1Bi1 Intermetallic Structure with Controllable C–H and C–O Bond Activation Ability for Enhanced Diethylene Glycol Oxidation

“…Regulating the Pt site via introducing a second metal promoter is the most widely adopted strategy for enhancing the catalytic performance . Such bimetallic catalysts display unique geometry coordination environments and electronic structures that are different from the parent Pt metal. − In particular, Pt-based intermetallic compounds (IMCs), such as the tetragonal L10-type PtM with heterometal atoms bonded, can be varied to a limited extent while still maintaining a highly structured lattice structure with a large number of interatomic bonding bonds, accompanied by a strong d–d orbital interaction. − Therefore, they have been widely used in polyol oxidation and CO 2 hydrogenation reactions. − For instance, Feng et al found that the introduction of Bi to Pt can induce the formation of a Pt–Bi active structure, promoting selective oxidation of the C–H bond on glycerol. Guo et al reported that reducing the exposure of surface Pd sites by introducing Cu maintains the high C–H bond activation ability and simultaneously inhibits the C–C bond cleavage for the oxidation of isopropanol to acetone.…”